Half Equation

Key Stage 4

Meaning

A half equation is a type of symbol equation which shows how individual ions gain or lose electrons in ionic chemical reactions.

About Half Equations

In half equations only one ion is considered at a time.

Half equations use the letter 'e' to represent electrons.

Half equations can be taken from balanced symbol equations.

Examples

Balanced Symbol Equation: 4Li + O₂ → 2Li₂O

Half Equations

Li → Li⁺ + e^-

O₂ + 4e^- → 2O^-2